I am new to Hibernate. Please help me to resolve the below mentioned error :

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/collections/map/LRUMap
at org.hibernate.util.SimpleMRUCache.init(SimpleMRUCache.java:71)
at org.hibernate.util.SimpleMRUCache.<init>(SimpleMRUCache.java:55)
at org.hibernate.util.SimpleMRUCache.<init>(SimpleMRUCache.java:50)
at org.hibernate.engine.query.QueryPlanCache.<init>(QueryPlanCache.java:65)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:182)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1341)
at com.Hibernate.Demo.FirstHibernateProgram.main(FirstHibernateProgram.java:19)